docker部署spring-boot项目后，验证码获取报错解决

报错信息如下：

2020-10-21 16:13:03.603 ERROR 9 --- [ XNIO-1 task-2] c.e.c.s.handler.GlobalExceptionHandler : 全局异常信息 ex=null java.lang.NullPointerException: null at sun.awt.FontConfiguration.getVersion(FontConfiguration.java:1264) at sun.awt.FontConfiguration.readFontConfigFile(FontConfiguration.java:219) at sun.awt.FontConfiguration.init(FontConfiguration.java:107) at sun.awt.X11FontManager.createFontConfiguration(X11FontManager.java:774) at sun.font.SunFontManager$2.run(SunFontManager.java:431) at java.security.AccessController.doPrivileged(Native Method) at sun.font.SunFontManager.<init>(SunFontManager.java:376) at sun.awt.FcFontManager.<init>(FcFontManager.java:35) at sun.awt.X11FontManager.<init>(X11FontManager.java:57) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at java.lang.Class.newInstance(Class.java:442) at sun.font.FontManagerFactory$1.run(FontManagerFactory.java:83) at java.security.AccessController.doPrivileged(Native Method) at sun.font.FontManagerFactory.getInstance(FontManagerFactory.java:74) at java.awt.Font.getFont2D(Font.java:491) at java.awt.Font.access$000(Font.java:224) at java.awt.Font$FontAccessImpl.getFont2D(Font.java:228) at sun.font.FontUtilities.getFont2D(FontUtilities.java:180) at sun.java2d.SunGraphics2D.checkFontInfo(SunGraphics2D.java:670) at sun.java2d.SunGraphics2D.getFontInfo(SunGraphics2D.java:831) at sun.java2d.pipe.GlyphListPipe.drawString(GlyphListPipe.java:50) at sun.java2d.pipe.ValidatePipe.drawString(ValidatePipe.java:165) at sun.java2d.SunGraphics2D.drawString(SunGraphics2D.java:2926) at cn.hutool.core.img.GraphicsUtil.drawString(GraphicsUtil.java:113) at cn.hutool.core.img.GraphicsUtil.drawStringColourful(GraphicsUtil.java:77) at cn.hutool.captcha.LineCaptcha.drawString(LineCaptcha.java:75) at cn.hutool.captcha.LineCaptcha.createImage(LineCaptcha.java:58) at cn.hutool.captcha.AbstractCaptcha.createCode(AbstractCaptcha.java:102) at cn.hutool.captcha.AbstractCaptcha.getCode(AbstractCaptcha.java:126) at com.entfrm.auth.controller.CaptchaController.randomImage(CaptchaController.java:65) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:892) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797) at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1039) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:897) at javax.servlet.http.HttpServlet.service(HttpServlet.java:645) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882) at javax.servlet.http.HttpServlet.service(HttpServlet.java:750) at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:74) at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129) at com.entfrm.auth.filter.CaptchaFilter.doFilterInternal(CaptchaFilter.java:45) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:209) at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:178) at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:357) at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:270) at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:92) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84) at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62) at io.undertow.servlet.handlers.ServletChain$1.handleRequest(ServletChain.java:68) at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36) at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:132) at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57) at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46) at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64) at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60) at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77) at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43) at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:292) at io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:81) at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:138) at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:135) at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48) at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43) at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:272) at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81) at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:104) at io.undertow.server.Connectors.executeRootHandler(Connectors.java:364) at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:830) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748)

经过资料查询，大概是字体环境问题

尝试通过在DockerFile中添加代码解决：

apk add --update ttf-dejavu fontconfig

添加后的DockerFile

#V1.0 Dockerfile文件编写 # 基础镜像 FROM openjdk:8-jdk-alpine # 维护者信息 MAINTAINER 445184148@qq.com #数据卷 VOLUME /entfrm-boot #解决时间 ENV TZ=Asia/Shanghai RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime \ && echo $TZ > /etc/timezone\ #替换源 && echo "https://mirror.tuna.tsinghua.edu.cn/alpine/v3.4/main" > /etc/apk/repositories \ && echo "https://mirror.tuna.tsinghua.edu.cn/alpine/v3.4/community" >> /etc/apk/repositories \ && echo "https://mirror.tuna.tsinghua.edu.cn/alpine/edge/testing" >> /etc/apk/repositories\ #安装nginx && apk add nginx --no-cache\ #安装redis && apk add redis --no-cache\ #解决验证码获取报错的问题 && apk add --update ttf-dejavu fontconfig\ #创建nginx运行基础目录 && mkdir -p /run/nginx /var/www/html/entfrm-ui\ #覆盖nginx配置 && echo "\ user root;\ worker_processes 1;\ pid /var/run/nginx.pid;\ events {\ worker_connections 1024;\ }\ http {\ include /etc/nginx/mime.types;\ default_type application/octet-stream;\ sendfile on;\ keepalive_timeout 120;\ client_max_body_size 20m;\ gzip on;\ server {\ listen 80;\ server_name localhost;\ location / {\ root /var/www/html/entfrm-ui/;\ try_files \$uri \$uri/ /index.html;\ index index.html index.htm;\ }\ location /pro/{\ proxy_pass http://localhost:8888/;\ proxy_set_header Host \$http_host;\ proxy_set_header X-Real-IP \$remote_addr;\ proxy_set_header REMOTE-HOST \$remote_addr;\ proxy_set_header X-Forwarded-For \$proxy_add_x_forwarded_for;\ }\ }\ }" > /etc/nginx/nginx.conf \ #创建启动脚本 && touch /etc/init.d/start.sh \ && chmod +x /etc/init.d/start.sh \ && echo "#!/bin/sh " >> /etc/init.d/start.sh\ && echo "/usr/sbin/nginx -c /etc/nginx/nginx.conf" >> /etc/init.d/start.sh\ && echo "/usr/bin/redis-server & " >> /etc/init.d/start.sh\ && echo "java -jar /entfrm-web.jar " >> /etc/init.d/start.sh #添加前端文件 ADD entfrm-ui/dist/ /var/www/html/entfrm-ui/ #添加应用 ADD entfrm-web/target/entfrm-web.jar entfrm-web.jar #开放端口 EXPOSE 80 8888 #启动 ENTRYPOINT /bin/sh -c /etc/init.d/start.sh entfrm entfrm:v1.0

 

重新制作镜像，并运行，问题解决！